Rubyでローマ数字を求める - Qiita

def getNums() lines = readlines len = lines.length (0..len-1).each do |i| lines[i] = lines[i].chomp.to_i end return lines end class Integer def to_roman sym = ['I', 'V', 'X', 'L', 'C', 'D', 'M'] roman = '' to_arr(4).each_with_index do |num, i| case i when 0 then roman += sym[6] * num when 1 then case num when 0..3 then roman += sym[4] * num when 4 then roman += sym[4] + sym[5] when 5..8 then roman